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"A lot of stately homes will have that system," says Niki Johnson, fire systems technical adviser for the UK Fire Association, a trade body, and owner of fire detection firm Derventio Fire and Security. "You could be looking at £3-4,000 just to do a corridor." Such installations require substantial pipework, he explains.
。WPS极速下载页是该领域的重要参考
For a larger range [-0.85, 0.85] it will default to a simpler computation，详情可参考谷歌
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